Professional double-sided woodturners credit card stone with 300 and 180 grit. This precision credit card stone is perfect for sharpening roughing gouges, HSS hollow inserts coring inserts, and repairing damaged edges. Great for small turning and carving tools. It can create a durable edge on roughing gouges in seconds and will give a tough lasting burr on a scraper. Dimensions: Length: 85mm (3") Width: 50mm (2") Thickness: 1.6mm Grit: 300 / 180 Comes complete with storage wallet. Guaranteed for 5 Years when used with James Barry Original Formula Lapping Fluid Be careful when breaking in a coarse side (300 grit / 50 micron) to wipe down the tool thoroughly before moving to the fine side (1000 grit / 15 micron) to avoid cross-contamination and therefore taking a much coarser diamond onto a much finer side, it will scratch it!  Once the stone is worn in, you will not need to be quite so thorough as there is no longer a threat of cross-contamination. The diamond is electroplated directly onto a precision ground substrate. Both sides are electroplated onto the same precision ground substrate giving the best possible flatness.  For the best quality, the diamond has to be electroplated directly onto the surface.  Ensure that you use the James Barry Sharpening lapping fluid, the original fluid introduced into the Woodworking Industry by James Barry sharpening  Solutions some 30 yrs ago. Lapping fluid is a synthetic based petroleum lubricant formulated to be used with diamond compounds.  This superior lubricant, with its penetrating qualities and oil/water solubility, not only increases the cutting action but assures superior lubrication of every diamond particle throughout the honing process. Product code:ECCCM